Shank and bit punch



Sept. 2.''``,`'`1`925".v v1554,799

J. DITSON SHANK AND BIT PUNcH Filed March 21, 1925 Ill' 'zw H 15 ATTO EY Patented Sept. 22, v1925.

JEssEr Drrsonor nrrrnn'roitfcoiioniino; irssrcii'v'onl 'ro iivGERsoLL-RAND coivirAnY orJimsEY cITYyNEiW JERsEY, ALcoRronA'rioN or' NEW JERsEY.

SHANK AND BIT lPUNCI-I.

` Application filed March 21,;1925.` Serial' No. 17,451.

T (ZZZ 107mm tmag/ co'noflcra: j

Be it known that I, J iissn Dirsorr, a citizen of the United States, a'resident of Littleton, inthe county of Arapahoc and State of' Colorado,fliav e invented acertain Shank and Bit Puncli, of whichi theufollowing is a specification, acooinpanied by drawings. a `,This invention relates tddevicesfor reforiningfth-e bore of hollow articles, `but more pinning outthe bore adj acentv the shank and bit of drill steels, especially 'when tlie bore becoines defoi'ined during the process of sharpening. z j a VAn object' of-the iiivention istodi'ive a punch pin into a ib'ore of the drill steel and witlidraw it therefroni' bydelivering impact member' in tlie -direction of the exposed end.1 Otherobjects will be in part obvious andv in part pointed out hereinafter.

Iii the drawings `forining part of the specification and in which similar reference characters refer tovsiinilar parts,

the position of the parts when driving the punoh piniiitothefdrill steel; and

Fig. Qiis a sinfiilarview showing the posi-` tion of the parts when withdrawing the pin;

from the drill steel. i

.Referring to t the.{drawiiigs,a shank and bit punch having a hannner cyhnder A and a .feed cylinderd is shown' inounted slidably upon a bar C. The device inay `bezfinounted on a drill' sharfpener, for on a pedestal, or as shown in which a bracket D supports one end of the bar O and the other end of the bar is supported by a. post E. In this instance, the post E rests on the base of the bracket D and may tei'ininate in a jaw F at its upper end. A inovable jaw G cooperates with the jaw F for holding a hollow drill steel I-I, although these aws may be upon the drill sharpencr. The jaws are so positioned that the long'itudinal axes of the drill steel I-I and the hammer cylinder A coincide.

In accordance with the present inveiition, a haininer piston J of the differential type having a hollow bore is adapted to reciproparticularly to; a fluid actuated' devicefor Another object is to enable either end of cate withn'thecylinder A. In this instance the anvil block K supports a puncli pin L at its forward end. The anvil block K also has a shank which extends through the bore of the piston and is provided with a collar K'jneai' one end to receive the' impact blows of the piston for driving the punch pin into the boi'e I-I' of the drill steel. Means Vare provided for ut-ilizing impact blows of the piston J to withdraw the punch pin L from the steel I-I. To this end, the reai'wai'd end of the` shank of the anvil block K is screw threaded and carrics a recessed nut O. Disposed within the nut O, is a compression spring P, the ends Q, andR of which are adaptedto extend into aper-` tures S and T of the shank of the Vanvil block K and .the nut O respectively, to hold the nut against rotation witli respect i to' the anvil block. In addition to lock'ing` the nut, the spring P also exerts pressure against the nut and forces the inner surfaces of the cooperating threads in full contact with each other, thus protecting the threads against breakage which might otherwise be caused by the blows of the hamnier piston J against the nut O. l i

In this instance a back head U forms a i closure for the rearward end of the cylinder Figure 1 is a longitudinal sectional view inl elevation of a shank and bit'punch showing A, suitable vent U' is foi'med in the back head U to `pre'vent` cushioning of the blows while the anvil block K isl being driven rearwardly. Afront head `W is arranged in.

theothel",` end` of't-he cylinder A land has a bore X tosupport the forward. end of the anvil blockl K.` A recessY in the front head VV is adapted to receive the collar K' of the anvil block K when the nut O is exposed to the blows of the hainnier piston J. The front and back heads IV and U are held to the cylinder by the usual through bolts, not shown.

The adinissioii of the pressure fluid to the cylinders A and B is controlled by a throttle valve Z having a throttle lever Z'. In this instance the throttle valve is provided with a pair of poi'ts o and c which are arranged so that one or the other of said ports inay register with the passage d for supplying pressure fluid to the hanimer cylinder A. A

similar pair of ports c and are adapted to register with passages g andhi respectively for supplying pressure fluid to the ends'of the cylinder B. In this instance grooveS 7' and lc are formed on opposit'e sides of the valve Z and are so arranged that one of said grooves will register with one of the passages to the cylinder B and an exhaust passage o in either position of the valve for exhaustingl pressure fiuid from one end of said cylinder while pressure fluid is being admitted to the other end; A piston p is arranged within the cylinder B and is held stationary by a rod g anchored at one end to the bracket D.

Constant pressure is maintained in the; rear end of the cylinder A, and distribution of the pressure fluid to the opposite faces of the head of the piston J is Controlled by the shank of said piston. Pressure fluid is admitted to the forward end of the cylinder A through a passage r which communicates at its lrearward end with said cylinder at a point between the passage (Z and the rearward end of the cylinder A. The eXhaust of pressure fluid vfrom-the cylinder A is effected through an exhaust passage 8 controlled by the head of the piston J.

In operation of the device, let it be assunied that the punch L is about to be driven into the steel H. lVith the valve in the position shown in Figure 1, pressure fluid is admitted simultaneously to the hammer cylinder A and the-forward end of the feed cylinder B which will cause the device to move toward the steel H. As the device continues in this direction the punch L is pressed against the end of the steel H and is held temporarily stationary until the cylinder has advanced sufliciently to eXpose the collar K' of the anvil block to the blows of the piston J, whereupon the punch will be driven into the steel H.

In order to withdraw the punch L from The device will then move rearwardly, andv since the punchL tends to blind in the drill steel H, the anvil'ablock will be'held against moveme'nt until-'l the nut O isfeipsed to the blows ofthe hammer pistonJ thereby withdrawin the punch L 'from the drill steel.

It wl be'observedtliat vduifig` the withdrawl of theV punch, the collar' K' is removedfrom the path of the piston J which is also true of the nut O while the p'unch is being driveninto the drill steel.

I claim: w

1. In a shank and bit punclr, the combination of a guide, av hamrner cylinder slidable on said guide, a reci'procatory hammer pistonl in said cylinder, a longitudinally movablei anvil block eX'ten'ding through said piston,-

a punch pin carried by the forward end of the anvil block, a collar on said anvil block to receive the blows of the pistonA when the cylinder moves'in one'direction, a nut screwed on the anvil block to receive the blows ofthe piston when th'e'cyl'inder moves` in the opposite direction, a spring to' lock the nut against rotation With respect to the anvil block, a cylinder adapted to receive pressure fluid at itsendsv to move the device along the guide, and a piston insaid cylinder. 2. In ashank and bit punch,` the combinas tion of a guide, a hammer cylinder slidable on said guide, a reciprocatory hammer piston in said cylinder, a longitudinally movable anvil block extending through said piston, a punch pin carried by the forward end of the anvil block, a collar on said anvil block? to receive the blows of the piston when the cylinder movesin one direction,,a nut screwed on the anvil block to receive the blows of the piston When the cylinder moves in the opposite directio-n,l a spring` interposed between the anvil block and the nut and a'nchored to said anvil block and nut for holdi'ng the nut against rotation with respect to the anvil block and to force the faces of the nut threads to contact with the corresponding faces of the threads on the anvil block, a feed cylinder for moving the device along; the guide, a piston in said cylinder, and po-rts` and passages for supplin-gl pressure fluid to the cylinders.=

In testimony whereof I have' sig'ned this specification.

JESSE" DITSON. 

